setattr(self, k, v)
-class FPGetOpA(FPState):
- """ gets operand a
+class FPGetOpMod:
+ def __init__(self, width):
+ self.in_op = FPOp(width)
+ self.out_op = FPNumIn(self.in_op, width)
+ self.out_decode = Signal(reset_less=True)
+
+ def setup(self, m, in_op, out_op, out_decode):
+ """ links module to inputs and outputs
+ """
+ m.d.comb += self.in_op.copy(in_op)
+ m.d.comb += out_op.v.eq(self.out_op.v)
+ m.d.comb += out_decode.eq(self.out_decode)
+
+ def elaborate(self, platform):
+ m = Module()
+ m.d.comb += self.out_decode.eq((self.in_op.ack) & (self.in_op.stb))
+ #m.submodules.get_op_in = self.in_op
+ m.submodules.get_op_out = self.out_op
+ with m.If(self.out_decode):
+ m.d.comb += [
+ self.out_op.decode(self.in_op.v),
+ ]
+ return m
+
+
+class FPGetOp(FPState):
+ """ gets operand
"""
- def __init__(self, in_a, width):
- FPState.__init__(self, "get_a")
- self.in_a = in_a
- self.a = FPNumIn(in_a, width)
+ def __init__(self, in_state, out_state, in_op, width):
+ FPState.__init__(self, in_state)
+ self.out_state = out_state
+ self.mod = FPGetOpMod(width)
+ self.in_op = in_op
+ self.out_op = FPNumIn(in_op, width)
+ self.out_decode = Signal(reset_less=True)
def action(self, m):
- self.get_op(m, self.in_a, self.a, "get_b")
+ with m.If(self.out_decode):
+ m.next = self.out_state
+ m.d.sync += [
+ self.in_op.ack.eq(0),
+ self.out_op.copy(self.mod.out_op)
+ ]
+ with m.Else():
+ m.d.sync += self.in_op.ack.eq(1)
class FPGetOpB(FPState):
""" gets operand b
"""
+ def __init__(self, in_b, width):
+ FPState.__init__(self, "get_b")
+ self.in_b = in_b
+ self.b = FPNumIn(self.in_b, width)
+
def action(self, m):
self.get_op(m, self.in_b, self.b, "special_cases")
# if a is NaN or b is NaN return NaN
with m.If(self.in_a.is_nan | self.in_b.is_nan):
m.d.comb += self.out_do_z.eq(1)
- m.d.comb += self.out_z.nan(1)
+ m.d.comb += self.out_z.nan(0)
# XXX WEIRDNESS for FP16 non-canonical NaN handling
# under review
m.d.comb += self.out_z.inf(self.in_a.s)
# if a is inf and signs don't match return NaN
with m.If(self.in_b.exp_128 & s_nomatch):
- m.d.comb += self.out_z.nan(1)
+ m.d.comb += self.out_z.nan(0)
# if b is inf return inf
with m.Elif(self.in_b.is_inf):
m.next = "denormalise"
+class FPAddDeNormMod(FPState):
+
+ def __init__(self, width):
+ self.in_a = FPNumBase(width)
+ self.in_b = FPNumBase(width)
+ self.out_a = FPNumBase(width)
+ self.out_b = FPNumBase(width)
+
+ def setup(self, m, in_a, in_b, out_a, out_b):
+ """ links module to inputs and outputs
+ """
+ m.d.comb += self.in_a.copy(in_a)
+ m.d.comb += self.in_b.copy(in_b)
+ m.d.comb += out_a.copy(self.out_a)
+ m.d.comb += out_b.copy(self.out_b)
+
+ def elaborate(self, platform):
+ m = Module()
+ m.submodules.denorm_in_a = self.in_a
+ m.submodules.denorm_in_b = self.in_b
+ m.submodules.denorm_out_a = self.out_a
+ m.submodules.denorm_out_b = self.out_b
+ # hmmm, don't like repeating identical code
+ m.d.comb += self.out_a.copy(self.in_a)
+ with m.If(self.in_a.exp_n127):
+ m.d.comb += self.out_a.e.eq(self.in_a.N126) # limit a exponent
+ with m.Else():
+ m.d.comb += self.out_a.m[-1].eq(1) # set top mantissa bit
+
+ m.d.comb += self.out_b.copy(self.in_b)
+ with m.If(self.in_b.exp_n127):
+ m.d.comb += self.out_b.e.eq(self.in_b.N126) # limit a exponent
+ with m.Else():
+ m.d.comb += self.out_b.m[-1].eq(1) # set top mantissa bit
+
+ return m
+
+
class FPAddDeNorm(FPState):
+ def __init__(self, width):
+ FPState.__init__(self, "denormalise")
+ self.mod = FPAddDeNormMod(width)
+ self.out_a = FPNumBase(width)
+ self.out_b = FPNumBase(width)
+
def action(self, m):
# Denormalised Number checks
m.next = "align"
- self.denormalise(m, self.a)
- self.denormalise(m, self.b)
+ m.d.sync += self.a.copy(self.out_a)
+ m.d.sync += self.b.copy(self.out_b)
class FPAddAlignMultiMod(FPState):
m.d.comb += self.exp_eq.eq(0)
m.d.comb += self.out_a.copy(self.in_a)
m.d.comb += self.out_b.copy(self.in_b)
- with m.If(self.in_a.e > self.in_b.e):
+ agtb = Signal(reset_less=True)
+ altb = Signal(reset_less=True)
+ m.d.comb += agtb.eq(self.in_a.e > self.in_b.e)
+ m.d.comb += altb.eq(self.in_a.e < self.in_b.e)
+ with m.If(agtb):
m.d.comb += self.out_b.shift_down(self.in_b)
# exponent of b greater than a: shift a down
- with m.Elif(self.in_a.e < self.in_b.e):
+ with m.Elif(altb):
m.d.comb += self.out_a.shift_down(self.in_a)
# exponents equal: move to next stage.
with m.Else():
def elaborate(self, platform):
m = Module()
- #m.submodules.add0_in_a = self.in_a
- #m.submodules.add0_in_b = self.in_b
+ m.submodules.add0_in_a = self.in_a
+ m.submodules.add0_in_b = self.in_b
#m.submodules.add0_in_z = self.in_z
#m.submodules.add0_out_z = self.out_z
m.d.comb += self.out_z.e.eq(self.in_a.e)
+
+ # store intermediate tests (and zero-extended mantissas)
+ seq = Signal(reset_less=True)
+ mge = Signal(reset_less=True)
+ am0 = Signal(len(self.in_a.m)+1, reset_less=True)
+ bm0 = Signal(len(self.in_b.m)+1, reset_less=True)
+ m.d.comb += [seq.eq(self.in_a.s == self.in_b.s),
+ mge.eq(self.in_a.m >= self.in_b.m),
+ am0.eq(Cat(self.in_a.m, 0)),
+ bm0.eq(Cat(self.in_b.m, 0))
+ ]
# same-sign (both negative or both positive) add mantissas
- with m.If(self.in_a.s == self.in_b.s):
+ with m.If(seq):
m.d.comb += [
- self.out_tot.eq(Cat(self.in_a.m, 0) + Cat(self.in_b.m, 0)),
+ self.out_tot.eq(am0 + bm0),
self.out_z.s.eq(self.in_a.s)
]
# a mantissa greater than b, use a
- with m.Elif(self.in_a.m >= self.in_b.m):
+ with m.Elif(mge):
m.d.comb += [
- self.out_tot.eq(Cat(self.in_a.m, 0) - Cat(self.in_b.m, 0)),
+ self.out_tot.eq(am0 - bm0),
self.out_z.s.eq(self.in_a.s)
]
# b mantissa greater than a, use b
with m.Else():
m.d.comb += [
- self.out_tot.eq(Cat(self.in_b.m, 0) - Cat(self.in_a.m, 0)),
+ self.out_tot.eq(bm0 - am0),
self.out_z.s.eq(self.in_b.s)
]
return m
"""
m.d.comb += self.in_z.copy(in_z)
m.d.comb += self.in_tot.eq(in_tot)
- m.d.comb += out_z.copy(self.out_z)
- m.d.comb += out_of.copy(self.out_of)
+ #m.d.comb += out_z.copy(self.out_z)
+ #m.d.comb += out_of.copy(self.out_of)
def elaborate(self, platform):
m = Module()
- m.submodules.add1_out_overflow = self.out_of
#m.submodules.norm1_in_overflow = self.in_of
+ #m.submodules.norm1_out_overflow = self.out_of
#m.submodules.norm1_in_z = self.in_z
#m.submodules.norm1_out_z = self.out_z
m.d.comb += self.out_z.copy(self.in_z)
self.mod = FPAddStage1Mod(width)
self.out_z = FPNumBase(width, False)
self.out_of = Overflow()
+ self.norm_stb = Signal()
def action(self, m):
- #m.d.sync += self.of.copy(self.out_of)
- m.d.sync += self.z.copy(self.out_z)
+ m.submodules.add1_out_overflow = self.out_of
+ m.d.sync += self.out_of.copy(self.mod.out_of)
+ m.d.sync += self.out_z.copy(self.mod.out_z)
+ m.d.sync += self.norm_stb.eq(1)
m.next = "normalise_1"
class FPNorm1Mod:
def __init__(self, width):
+ self.width = width
+ self.in_select = Signal(reset_less=True)
self.out_norm = Signal(reset_less=True)
self.in_z = FPNumBase(width, False)
- self.out_z = FPNumBase(width, False)
self.in_of = Overflow()
+ self.temp_z = FPNumBase(width, False)
+ self.temp_of = Overflow()
+ self.out_z = FPNumBase(width, False)
self.out_of = Overflow()
- def setup(self, m, in_z, out_z, in_of, out_of, out_norm):
- """ links module to inputs and outputs
- """
- m.d.comb += self.in_z.copy(in_z)
- m.d.comb += out_z.copy(self.out_z)
- m.d.comb += self.in_of.copy(in_of)
- m.d.comb += out_of.copy(self.out_of)
- m.d.comb += out_norm.eq(self.out_norm)
-
def elaborate(self, platform):
m = Module()
- m.submodules.norm1_in_overflow = self.in_of
+ m.submodules.norm1_out_z = self.out_z
m.submodules.norm1_out_overflow = self.out_of
+ m.submodules.norm1_temp_z = self.temp_z
+ m.submodules.norm1_temp_of = self.temp_of
m.submodules.norm1_in_z = self.in_z
- m.submodules.norm1_out_z = self.out_z
- m.d.comb += self.out_z.copy(self.in_z)
- m.d.comb += self.out_of.copy(self.in_of)
- m.d.comb += self.out_norm.eq((self.in_z.m_msbzero) & \
- (self.in_z.exp_gt_n126))
- with m.If(self.out_norm):
+ m.submodules.norm1_in_overflow = self.in_of
+ in_z = FPNumBase(self.width, False)
+ in_of = Overflow()
+ m.submodules.norm1_insel_z = in_z
+ m.submodules.norm1_insel_overflow = in_of
+ # select which of temp or in z/of to use
+ with m.If(self.in_select):
+ m.d.comb += in_z.copy(self.in_z)
+ m.d.comb += in_of.copy(self.in_of)
+ with m.Else():
+ m.d.comb += in_z.copy(self.temp_z)
+ m.d.comb += in_of.copy(self.temp_of)
+ # initialise out from in (overridden below)
+ m.d.comb += self.out_z.copy(in_z)
+ m.d.comb += self.out_of.copy(in_of)
+ # normalisation increase/decrease conditions
+ decrease = Signal(reset_less=True)
+ increase = Signal(reset_less=True)
+ m.d.comb += decrease.eq(in_z.m_msbzero & in_z.exp_gt_n126)
+ m.d.comb += increase.eq(in_z.exp_lt_n126)
+ m.d.comb += self.out_norm.eq(decrease | increase) # loop-end condition
+ # decrease exponent
+ with m.If(decrease):
m.d.comb += [
- self.out_z.e.eq(self.in_z.e - 1), # DECREASE exponent
- self.out_z.m.eq(self.in_z.m << 1), # shift mantissa UP
- self.out_z.m[0].eq(self.in_of.guard), # steal guard (was tot[2])
- self.out_of.guard.eq(self.in_of.round_bit), # round (was tot[1])
+ self.out_z.e.eq(in_z.e - 1), # DECREASE exponent
+ self.out_z.m.eq(in_z.m << 1), # shift mantissa UP
+ self.out_z.m[0].eq(in_of.guard), # steal guard (was tot[2])
+ self.out_of.guard.eq(in_of.round_bit), # round (was tot[1])
self.out_of.round_bit.eq(0), # reset round bit
- self.out_of.m0.eq(self.in_of.guard),
+ self.out_of.m0.eq(in_of.guard),
+ ]
+ # increase exponent
+ with m.If(increase):
+ m.d.comb += [
+ self.out_z.e.eq(in_z.e + 1), # INCREASE exponent
+ self.out_z.m.eq(in_z.m >> 1), # shift mantissa DOWN
+ self.out_of.guard.eq(in_z.m[0]),
+ self.out_of.m0.eq(in_z.m[1]),
+ self.out_of.round_bit.eq(in_of.guard),
+ self.out_of.sticky.eq(in_of.sticky | in_of.round_bit)
]
return m
def __init__(self, width):
FPState.__init__(self, "normalise_1")
self.mod = FPNorm1Mod(width)
+ self.stb = Signal(reset_less=True)
+ self.ack = Signal(reset=0, reset_less=True)
self.out_norm = Signal(reset_less=True)
+ self.in_accept = Signal(reset_less=True)
+ self.temp_z = FPNumBase(width)
+ self.temp_of = Overflow()
self.out_z = FPNumBase(width)
self.out_of = Overflow()
- def action(self, m):
- #m.d.sync += self.of.copy(self.out_of)
- m.d.sync += self.z.copy(self.out_z)
- with m.If(~self.out_norm):
- m.next = "normalise_2"
-
-
-class FPNorm2Mod:
-
- def __init__(self, width):
- self.out_norm = Signal(reset_less=True)
- self.in_z = FPNumBase(width, False)
- self.out_z = FPNumBase(width, False)
- self.in_of = Overflow()
- self.out_of = Overflow()
-
- def setup(self, m, in_z, out_z, in_of, out_of, out_norm):
+ def setup(self, m, in_z, in_of, norm_stb):
""" links module to inputs and outputs
"""
- m.d.comb += self.in_z.copy(in_z)
- m.d.comb += out_z.copy(self.out_z)
- m.d.comb += self.in_of.copy(in_of)
- m.d.comb += out_of.copy(self.out_of)
- m.d.comb += out_norm.eq(self.out_norm)
-
- def elaborate(self, platform):
- m = Module()
- m.submodules.norm2_in_overflow = self.in_of
- m.submodules.norm2_out_overflow = self.out_of
- m.submodules.norm2_in_z = self.in_z
- m.submodules.norm2_out_z = self.out_z
- m.d.comb += self.out_z.copy(self.in_z)
- m.d.comb += self.out_of.copy(self.in_of)
- m.d.comb += self.out_norm.eq(self.in_z.exp_lt_n126)
- with m.If(self.out_norm):
- m.d.comb += [
- self.out_z.e.eq(self.in_z.e + 1), # INCREASE exponent
- self.out_z.m.eq(self.in_z.m >> 1), # shift mantissa DOWN
- self.out_of.guard.eq(self.in_z.m[0]),
- self.out_of.m0.eq(self.in_z.m[1]),
- self.out_of.round_bit.eq(self.in_of.guard),
- self.out_of.sticky.eq(self.in_of.sticky | self.in_of.round_bit)
- ]
+ m.submodules.normalise_1 = self.mod
- return m
+ m.d.comb += self.mod.in_z.copy(in_z)
+ m.d.comb += self.mod.in_of.copy(in_of)
+ m.d.comb += self.mod.in_select.eq(self.in_accept)
+ m.d.comb += self.mod.temp_z.copy(self.temp_z)
+ m.d.comb += self.mod.temp_of.copy(self.temp_of)
-class FPNorm2(FPState):
+ m.d.comb += self.out_z.copy(self.mod.out_z)
+ m.d.comb += self.out_of.copy(self.mod.out_of)
+ m.d.comb += self.out_norm.eq(self.mod.out_norm)
- def __init__(self, width):
- FPState.__init__(self, "normalise_2")
- self.mod = FPNorm2Mod(width)
- self.out_norm = Signal(reset_less=True)
- self.out_z = FPNumBase(width)
- self.out_of = Overflow()
+ m.d.comb += self.stb.eq(norm_stb)
+ m.d.sync += self.ack.eq(0) # sets to zero when not in normalise_1 state
def action(self, m):
- m.submodules.norm_of = self.out_of
- #m.d.sync += self.of.copy(self.out_of)
+ m.d.comb += self.in_accept.eq((~self.ack) & (self.stb))
+ m.d.sync += self.of.copy(self.out_of)
m.d.sync += self.z.copy(self.out_z)
- with m.If(~self.out_norm):
+ m.d.sync += self.temp_of.copy(self.out_of)
+ m.d.sync += self.temp_z.copy(self.out_z)
+ with m.If(self.out_norm):
+ with m.If(self.in_accept):
+ m.d.sync += [
+ self.ack.eq(1),
+ ]
+ with m.Else():
+ m.d.sync += self.ack.eq(0)
+ with m.Else():
+ # normalisation not required (or done).
m.next = "round"
+ m.d.sync += self.ack.eq(1)
class FPRoundMod:
def elaborate(self, platform):
m = Module()
m.d.comb += self.out_z.copy(self.in_z)
- m.submodules.round_in_z = self.in_z
- m.submodules.round_out_z = self.out_z
with m.If(self.in_roundz):
m.d.comb += self.out_z.m.eq(self.in_z.m + 1) # mantissa rounds up
with m.If(self.in_z.m == self.in_z.m1s): # all 1s
def action(self, m):
m.d.sync += self.z.v.eq(self.out_z.v)
- m.next = "put_z"
+ m.next = "pack_put_z"
class FPPutZ(FPState):
m = Module()
# Latches
- #a = FPNumIn(self.in_a, self.width)
- b = FPNumIn(self.in_b, self.width)
z = FPNumOut(self.width, False)
-
- m.submodules.fpnum_b = b
m.submodules.fpnum_z = z
w = z.m_width + 4
- geta = self.add_state(FPGetOpA(self.in_a, self.width))
- #geta.set_inputs({"in_a": self.in_a})
- #geta.set_outputs({"a": a})
- a = geta.a
- # XXX m.d.comb += a.v.eq(self.in_a.v) # links in_a to a
- m.submodules.fpnum_a = a
+ geta = self.add_state(FPGetOp("get_a", "get_b",
+ self.in_a, self.width))
+ a = geta.out_op
+ geta.mod.setup(m, self.in_a, geta.out_op, geta.out_decode)
+ m.submodules.get_a = geta.mod
- getb = self.add_state(FPGetOpB("get_b"))
- getb.set_inputs({"in_b": self.in_b})
- getb.set_outputs({"b": b})
- # XXX m.d.comb += b.v.eq(self.in_b.v) # links in_b to b
+ getb = self.add_state(FPGetOp("get_b", "special_cases",
+ self.in_b, self.width))
+ b = getb.out_op
+ getb.mod.setup(m, self.in_b, getb.out_op, getb.out_decode)
+ m.submodules.get_b = getb.mod
sc = self.add_state(FPAddSpecialCases(self.width))
sc.set_inputs({"a": a, "b": b})
sc.mod.setup(m, a, b, sc.out_z, sc.out_do_z)
m.submodules.specialcases = sc.mod
- dn = self.add_state(FPAddDeNorm("denormalise"))
+ dn = self.add_state(FPAddDeNorm(self.width))
dn.set_inputs({"a": a, "b": b})
- dn.set_outputs({"a": a, "b": b}) # XXX outputs same as inputs
+ #dn.set_outputs({"a": a, "b": b}) # XXX outputs same as inputs
+ dn.mod.setup(m, a, b, dn.out_a, dn.out_b)
+ m.submodules.denormalise = dn.mod
if self.single_cycle:
alm = self.add_state(FPAddAlignSingle(self.width))
else:
alm = self.add_state(FPAddAlignMulti(self.width))
alm.set_inputs({"a": a, "b": b})
- alm.set_outputs({"a": a, "b": b}) # XXX outputs same as inputs
+ #alm.set_outputs({"a": a, "b": b}) # XXX outputs same as inputs
alm.mod.setup(m, a, b, alm.out_a, alm.out_b, alm.exp_eq)
m.submodules.align = alm.mod
+ az1 = FPNumOut(self.width, False)
+ m.submodules.fpnum_az1 = az1
+
add0 = self.add_state(FPAddStage0(self.width))
- add0.set_inputs({"a": a, "b": b})
- add0.set_outputs({"z": z})
- add0.mod.setup(m, a, b, z, add0.out_z, add0.out_tot)
+ add0.set_inputs({"a": alm.out_a, "b": alm.out_b})
+ add0.set_outputs({"z": az1})
+ add0.mod.setup(m, alm.out_a, alm.out_b, az1, add0.out_z, add0.out_tot)
m.submodules.add0 = add0.mod
add1 = self.add_state(FPAddStage1(self.width))
- add1.set_inputs({"tot": add0.out_tot, "z": add0.out_z})
- add1.set_outputs({"z": z}) # XXX Z as output
- add1.mod.setup(m, add0.out_tot, add0.out_z, add1.out_z, add1.out_of)
+ #add1.set_outputs({"z": az}) # XXX Z as output
+ add1.mod.setup(m, add0.out_tot, az1, None, add1.out_of)
m.submodules.add1 = add1.mod
+ m.d.sync += add1.norm_stb.eq(0) # sets to zero when not in add1 state
+
+ az = add1.out_z
n1 = self.add_state(FPNorm1(self.width))
- n1.set_inputs({"z": z, "of": add1.out_of}) # XXX Z as output
- n1.set_outputs({"z": z}) # XXX Z as output
- n1.mod.setup(m, z, n1.out_z, add1.out_of, n1.out_of, n1.out_norm)
- m.submodules.normalise_1 = n1.mod
+ n1.set_inputs({"z": az, "of": add1.out_of}) # XXX Z as output
+ n1.set_outputs({"z": az}) # XXX Z as output
+ n1.setup(m, az, add1.out_of, add1.norm_stb)
- n2 = self.add_state(FPNorm2(self.width))
- n2.set_inputs({"z": n1.out_z, "of": n1.out_of})
- n2.set_outputs({"z": z})
- n2.mod.setup(m, n1.out_z, n2.out_z, n1.out_of, n2.out_of, n2.out_norm)
- m.submodules.normalise_2 = n2.mod
+ rnz = FPNumOut(self.width, False)
+ m.submodules.fpnum_rnz = rnz
rn = self.add_state(FPRound(self.width))
- rn.set_inputs({"z": n2.out_z, "of": n2.out_of})
- rn.set_outputs({"z": z})
- rn.mod.setup(m, n2.out_z, rn.out_z, n2.out_of)
+ rn.set_inputs({"of": n1.out_of})
+ rn.set_outputs({"z": rnz})
+ rn.mod.setup(m, n1.out_z, rn.out_z, add1.out_of)
m.submodules.roundz = rn.mod
cor = self.add_state(FPCorrections(self.width))
- cor.set_inputs({"z": rn.out_z}) # XXX Z as output
- cor.set_outputs({"z": z}) # XXX Z as output
- cor.mod.setup(m, z, cor.out_z)
+ cor.set_inputs({"z": rnz}) # XXX Z as output
+ cor.mod.setup(m, rnz, cor.out_z)
m.submodules.corrections = cor.mod
pa = self.add_state(FPPack(self.width))
pa.set_inputs({"z": cor.out_z}) # XXX Z as output
- pa.set_outputs({"z": z}) # XXX Z as output
pa.mod.setup(m, cor.out_z, pa.out_z)
m.submodules.pack = pa.mod
+ ppz = self.add_state(FPPutZ("pack_put_z"))
+ ppz.set_inputs({"z": pa.out_z})
+ ppz.set_outputs({"out_z": self.out_z})
+
pz = self.add_state(FPPutZ("put_z"))
pz.set_inputs({"z": z})
pz.set_outputs({"out_z": self.out_z})
projects / ieee754fpu.git / blobdiff